Raghuveer Nayak, 58, was a pharmacist and surgery center owner from Oak Brook. He has pleaded guilty to paying bribes to doctors for patient referrals and to tax fraud, according to media reports.

Nayak faces up to 23 years in prison and a fine of $500,000 when he is sentenced in January, though a prison term of one-and-a-half to five years is more likely under sentencing guidelines, according to reports.